Machine for forming curry-knife edges on rotary cutters.



No. 771,211. PATENTED SEPT. 27, 1904.

, I E. SCHROEDER. MACHINE FOR FORMING CURRY KNIFE BDGES 0N ROTARY GUTTERS.

APPLICATION PlLED 1730.10. 1903.

N0 MODEL.

WITNESSES: 1 0 0 IIVI/E/VTOH I m0 8 t parts and combinations of the same, as will UNITED STATES Patented September 27, 1904.

PATENT OFFICE.

EMIL SOHROEDER, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. '7 71,211, dated September 27, 1904.

Original application filed October 27, 1903, Serial No. 178,694. No. 184,558.

To all whom it m/tz concern.-

Be it known that I, EMIL SoHRoEDER, a citizen of the United States, and a resident of the city of New York, (East New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Machine for Forming Curry-Knife Edges on Rotary Cutters, of which'the following is a full, clear, and exact description, this being a division of the application for Letters Patent of the United States for a machine for grinding and forming cutter edges, Serial No. 178,694, filed by me October 27,1903.

The object of the invention is to provide a new and improved machine more especially designed for accurately forming an annular curry-knife edge on a circular cuttersuch, for instance, as is used in a fleshing and shaving machine for raw and dressed furs or skins, for which Letters Patent of the United States No. 741,553 were granted to me on October 13, 1903.

The invention consists of novel features and be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a plan view showing my invention in connection with a grinding-machine proper employed for grinding the edge of a disk cutter. Fig. 2 is an enlarged vertical section of a portion of the apparatus. Fig. 3 is a cross-section of a portion of a disk cutter when sharpened and before the edge thereof is turned. Fig. l is a similar section of the finished cutter having the curry-knife edge.

The improved machine for forming a curryknife edge on a rotary cutter is shown in connection with a grinding-machine fully described in the application for Letters Patent above referred to, so that a detailed description of the grinding-machine is not deemed necessary.

The cutter A is in the form of a disk se- Divided and this application filed December 10, 1903. Serial (No model.)

cured to a flange A and extending integrally from a pulley A having its hub fastened on a spindle A journaled in the main frame of the machine. The cutting edge of the cutter A is adapted to be engaged on opposite sides by the peripheral faces of the grinding-wheels D D. made of emery or other suitable material and rotating toward each other and standing one in front of the other for forming a sharp cutting edge A on the cutter, as plainly shown in Fig. 5. A driving-belt H passes over the pulley A of the cutter A. In practice two different speeds can be given to the cutter Athat is to say, a high speed is given when grinding the cutting edge A" of the cutter, so that the temper is not taken out of the latter, and a slow speed is employed when the cutter has been duly ground and its edge A is to be turned over to form a curry-knife edge A as shown in Fig. 4.

The tool for turning the edge A over to form the curry-knife edge A is arranged as follows: A friction-roller K is journaled in the forked end K of a rod K mounted to slide in a carrier L, and a portion of the rod K is threaded and engaged by a nut K held against longitudinal movement in the carrier L. Now when the nut K is turned by the operator the rod K is caused to slide lengthwise of the carrier L, so as to bring the friction-roller K in proper relation to the edge A of the cutter A. The carrier L is fulcrumed at its forward end at L on a baseplate N, fastened by a bolt N to a swingplate O, hung on centers P, carried on the main frame 0, to allow the said plate O to be swung into forward horizontal position when the edge-turning tool is to be used and to be thrown back when not required for use. The bolt N, previously mentioned, extends through a longitudinal slot O, formed in the swing-plate to allow of adjusting the base-plate lengthwise on the swingplate,according to the size of the cutter A under treatment. By the arrangement described it will be seen that the operator in taking hold of the rod K can impart a swinging motion from the right to the left to the carrier L at the time the friction-roller K engages, say, the right-hand side of the edge A,'the friction-roller K at the time standing at an angle to the said edge A*. During the swinging motion given to the rod K by the operator the friction-roller K is caused to move bodily around and in doing so exerts a gradual pressure on the edge A", so as to turn the same over to form the annular curry-knife edge A. During this operation it is desirable to grease the edge A, as Well as the roller K, to insure a gradual and uniform laying over of the cutting edge Without danger of injuring the same.

Fromthe foregoing it will be seen that in order to bring the cutter A into a proper condition for fieshing and shaving purposes it is necessary to first grind an accurate circular and sharp cutting edge A" and then turn the said edge over by the tool described, so as to produce the annular knife-edge A. When this has been done, the operator turns the handles B, so as to run the centers B out of engagement with the hub A to allow of conveniently removing the cutter A from the grinding and laying-over machine to permit of transferring the cutter to the fleshing and shaving machine. In practice the grinding- Wheels are run at the rate of three thousand revolutions a minute to one hundred and fifty revolutions of the cutter during the grinding operation, and for laying or turning the edge A" over the cutter is run about sixteen revolutions per minute.

The grinding takes about ten minutes and the overlaying operation or formation of the annular curry-knife edge usually takes about five minutes; but for either operation it is not necessary to employ highly-skilled labor, as the proper adjustment can readily be made.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. Means for the purpose specified, comprising a carrier mounted to swing laterally, a rod held adjustably in the carrier, and a vertical roller having parallel sides and journaled in one end of said rod, the other end of the rod forming a handle, substantially as set forth.

2. Means for the purpose specified, comprising a carrier, a rod mounted to slide in the carrier, means for adjusting the rod in the carrier, a friction-roller journaled in one end of the rod, a base-plate on Which the carrier is fulcrumed, and a swing-plate in Which the base-plate is held adjustably, as set forth.

In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

EMIL SCHROEDER.

Witnesses:

TI-IEO. Gr. HosTER, EVERARD BOLTON MARSHALL. 

